Born in Illinois and raised in Kansas, Dr. Chang is a fellow of the American Academy of Sleep Medicine and the American Academy of Neurology. Prior to joining Swedish he practiced sleep medicine for 15 years in south King County, having served as medical director for Highline Sleep Center in Burien, Auburn Regional Medical Center Sleep Disorder Center in Auburn, and Polyclinic Sleep Center in Seattle. Though clinical medicine remains the primary focus of his work, he has worked in sleep medicine policy through committees within the AAN and the AASM. He is a clinical instructor for the department of neurology at the UW School of Medicine. He has been nominated by his peers as a sleep medicine "top doctor" for multiple years in Seattle and Seattle Met magazines. He has also earned a private pilot license, and has a clinical interest in the topic of excessive daytime sleepiness as pertains to pilots and others in the transportation industry. He is married to Melissa, a pharmacist, and he has two boys.